package com.roroldo.springcloud.controller;


import com.roroldo.springcloud.entities.CommonResult;
import com.roroldo.springcloud.entities.Payment;
import com.roroldo.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

@RestController
@Slf4j
public class OrderController {
    // public static final String PAYMENT_URL = "http://localhost:8001";

    // 支付业务已经集群
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Resource
    private RestTemplate restTemplate;

    // 客户端用浏览器是get请求，但是底层实质发送post调用服务端8001
    @GetMapping("/consumer/payment/create")
    public CommonResult create(Payment payment) {
        log.info("{}", payment.getSerial());
        return restTemplate.postForObject(PAYMENT_URL + "/payment/create", payment, CommonResult.class);
    }

    @GetMapping("/consumer/payment/postForEntity/create")
    public CommonResult createByEntity(Payment payment) {
        log.info("{}", payment.getSerial());
        return restTemplate.postForEntity(PAYMENT_URL + "/payment/create", payment, CommonResult.class).getBody();
    }

    // 返回对象为响应体中数据转化成的对象，基本上可以理解为Json
    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult getPayment(@PathVariable("id") Long id) {
        return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id, CommonResult.class, id);
    }

    // 返回对象为ResponseEntity对象，包含了响应中的一些重要信息，比如响应头、响应状态码、响应体等
    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPaymentByEntity(@PathVariable Long id) {
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL + "/payment/get/" + id, CommonResult.class, id);
        if (entity.getStatusCode().is2xxSuccessful()) {
            log.info("服务请求成功！");
            return entity.getBody();
        } else {
            log.error("服务请求失败");
            return new CommonResult(403, "操作失败");
        }
    }

    @Resource
    private DiscoveryClient discoveryClient;
    @Resource
    private LoadBalancer loadBalancer;

    @GetMapping("/consumer/payment/lb")
    public String getPaymentLb() {
        // 获取所有注册到注册中心的服务器列表
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if (instances == null || instances.size() <= 0) {
            log.error("没有可用的服务列表");
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();
        return restTemplate.getForObject(uri + "/payment/lb", String.class);
    }

    // ====================> zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin() {
        return restTemplate.getForObject("http://localhost:8001" + "/payment/zipkin/", String.class);
    }
}
